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jQuery Ajax POST example with PHP

I am trying to send data from a form to a database. Here is the form I am using: 15 Answers ...
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What is the difference between == and equals() in Java?

I wanted to clarify if I understand this correctly: 23 Answers 23 ...
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NGINX to reverse proxy websockets AND enable SSL (wss://)?

I'm so lost and new to building NGINX on my own but I want to be able to enable secure websockets without having an additional layer. ...
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Hash Code and Checksum - what's the difference?

...o beyond that by allowing for error-correction). "Good" checksums are easy to compute, and can detect many types of data corruptions (e.g. one, two, three erroneous bits). A hashcode simply describes a mathematical function that maps data to some value. When used as a means of indexing in data stru...
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How to go to each directory and execute a command?

How do I write a bash script that goes through each directory inside a parent_directory and executes a command in each directory . ...
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Has an event handler already been added?

Is there a way to tell if an event handler has been added to an object? I'm serializing a list of objects into/out of session state so we can use SQL based session state... When an object in the list has a property changed it needs to be flagged, which the event handler took care of properly before...
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Best way to generate random file names in Python

In Python, what is a good, or the best way to generate some random text to prepend to a file(name) that I'm saving to a server, just to make sure it does not overwrite. Thank you! ...
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Navigation bar show/hide

I have an app with a navigation bar consisting of 2 bar buttons. I would like to hide and show this navigation bar when a user double taps the screen. ...
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Abusing the algebra of algebraic data types - why does this work?

The 'algebraic' expression for algebraic data types looks very suggestive to someone with a background in mathematics. Let me try to explain what I mean. ...
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What is the __del__ method, How to call it?

... which __del__ method is defined. I figured out that this method is used to destroy an instance of the class. However, I cannot find a place where this method is used. The main reason for that is that I do not know how this method is used, probably not like that: obj1.del() . So, my questions is ...